There is reasons to think this plausible. If you knock out all the stops except the western most to the eastern most, and set the directions to walking, the miles are only 2800 miles. In 5-1 we learn that they can run up to 50 mph. I forget the exact chapter, but I believe it was Kalani also mentioned that they didn't get tired swimming between islands. Boil that down to 2800mi/50mph = 2.3 days. Semi-plausible if you ask me.
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